In our robotics club, we have two NXT Bricks for testing programs. Up until the other day, both were working fine. However now after pressing the reset button in the hole below the USB connector, one of the bricks will not be recognized by my computer (Windows XP SP3). When I plug it in, I get the "USB Device Not Recognized" bubble that pops up in the bottom right hand corner. I have tried going through both RobotC and LEGO MINDSTORMS to redownload the new firmware. In RobotC, it doesn't show up at all in the Download Firmware window and in LEGO MINDSTORMS, it gives the error that the program "cannot locate the NXT Device to download firmware to".

Is there anything that I can do to make this brick work again?

Just as an fyi, the other brick still works fine.

Tue Oct 21, 2008 3:34 pm

Dick Swan

Creator

Joined: Fri Feb 09, 2007 9:21 amPosts: 615

Re: USB Device Not Recognized

Push and hold the "magic" reset button found in the bottom of the stud hole by the USB connector. Hold it in for at least 10 to 15 seconds.

You can get into the problem you've described if firmwared download is aborted partway through. Or, if you try to write a file to the NXT file system when the battery voltage is weak.

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